interactivechartview.h

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#ifndef OPENSWMMVIS_UI_WIDGETS_INTERACTIVECHARTVIEW_H
#define OPENSWMMVIS_UI_WIDGETS_INTERACTIVECHARTVIEW_H
 
#include <QChartView>
#include <QDateTime>
#include <QPoint>
#include <QRect>
#include <QTimer>
 
class QAbstractAxis;
class QChart;
class QRubberBand;
class QVariant;
 
namespace openswmmvis::ui {
 
class InteractiveChartView : public QChartView
{
    Q_OBJECT
public:
    enum class Mode {
        Select = 0,   
        Pan,          
        ZoomIn,       
        ZoomOut,      
    };
    Q_ENUM(Mode)
 
    enum class AxisEdge {
        None = 0,
        XMinimum,
        XMaximum,
        YMinimum,
        YMaximum,
    };
    Q_ENUM(AxisEdge)
 
    explicit InteractiveChartView(QChart *chart, QWidget *parent = nullptr);
    ~InteractiveChartView() override;
 
    Mode mode() const noexcept { return m_mode; }
    void setMode(Mode m);
 
    [[nodiscard]] AxisEdge axisEdgeAt(const QPoint &viewportPx) const;
 
    bool setAxisEdgeValue(AxisEdge edge, const QVariant &value);
 
    void resetZoom();
 
signals:
    void modeChanged(Mode m);
 
    void chartContextMenuRequested(const QPoint &globalPos);
 
    void xRangeSelectionChanged(QDateTime lo, QDateTime hi);
 
protected:
    void mousePressEvent(QMouseEvent *e) override;
    void mouseMoveEvent(QMouseEvent *e) override;
    void mouseReleaseEvent(QMouseEvent *e) override;
    void wheelEvent(QWheelEvent *e) override;
    void keyPressEvent(QKeyEvent *e) override;
    void leaveEvent(QEvent *e) override;
 
private:
    void applyModeCursor();
    static bool isClick(const QPoint &press, const QPoint &release) noexcept;
    void zoomAroundViewportPoint(const QPointF &viewportPx, qreal factor);
    QAbstractAxis *axisForEdge(AxisEdge edge) const;
    bool editAxisEdge(AxisEdge edge);
    void updateHoverTooltip(const QPointF &viewportPx);
 
    Mode   m_mode       = Mode::Select;
    bool   m_pressed    = false;
    bool   m_middlePanning = false;   
    bool   m_xSelecting    = false;   
    AxisEdge m_pressedAxisEdge = AxisEdge::None;
    QPoint m_pressPos;          
    QPoint m_lastPos;           
    QRubberBand *m_rubberBand = nullptr;
    QPoint m_rubberOrigin;
 
    QTimer m_hoverTimer;
    QPointF m_hoverPx;   
};
 
} // namespace openswmmvis::ui
 
#endif // OPENSWMMVIS_UI_WIDGETS_INTERACTIVECHARTVIEW_H